Don't replace UEFI services in insecure mode.

Signed-off-by: Peter Jones <pjones@redhat.com>
Also hook systab->BS->Exit() so we can e.g. exit back to BDS safely.

Signed-off-by: Peter Jones <pjones@redhat.com>
Make verbose stuff use console_notify

Signed-off-by: Peter Jones <pjones@redhat.com>